Below is the SolidWorks assembly model for our 1/4 scale prototype:

The full assembly can be downloaded here

The wall is the supporting of the whole device, on which tracks and air cylinders are fixed to.

A tube goes into the doorframe functioning as the diffuser of the LED light.

Each of the door panel consists of a sandwich structure - between the front and back acrylic layers is a layer of foam that supports the panel. The air cylinders go into the sandwich structures and attached to the panels at the end rods by shafts.

On the first door panel, two carriages are fixed to the panel which sliding along the tracks fixed to the wall.

On the second door panel, a track is fixed to the top of the panel of which the corresponding carriage is mounted on the wall; a roller is fixed to the bottom of the panel which slides along the rail on the floor.

The motion of the two panels are constrained by the tracks and rails. Each panel has two linear constraints. The motions are actuated by the pneumatic air cylinders.